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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e77d34d210d02c3acb3df4b1d49d794d81ad1fbca4dea897d787652b8995eeb' 
  AND token = 'hnQS/I/Vw8mPm97v8dmVzi+gHxmzru/4pTdCAEM0zmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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