Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81ac67f2cf13502cfce047500d1fecaee48f9001a1fa9c52f84f44b24ed5f66' 
  AND token = 'mOuBdSTDsC9aCHc/0n9P2U4k1j0fOTj79s1A3dXvPjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}