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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d9ed0b0a57d84f1b9505fbf3cc0838035fb3a72611ae77fa8b396991ef37c2a' 
  AND token = '7NNfiX1pIZuDrXSLknOrRKSLWymSdtSX94mxdAb7u54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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