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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '703c6ed94b2dfa0c60960adc1cc46a57b66e1323e022ca263ec43f25a02a6954' 
  AND token = '6wwHH6dPy7qqrv7ykSXDTjdHVs878cbt/Hqrb21o+co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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