Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c9244b204a0d56a2b06069362b2150cd364f47f4f16d3e2a427fc55b1fa77d' 
  AND token = 'ShQdBHR5qf2c/iP9QBV5pMy1Ie0hy4XcHyS4KqfHNcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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