Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0f598429d1a7f2118e0ce44e25006a849f457a3ca229c2229ce87cc7c300a4' 
  AND token = 'h1GR5jAZv9wrAyyVQq+8UwL5gXWLa5fw60vp/JCL1Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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