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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa2a6351019b6d10b198f7edb7e62db6bd07406ccb4c0ca117c16041f42a9618' 
  AND token = 'NrmXzdJbJHqD8u6/5qa0H36u67XDYCEpT7s8TlE1PKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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