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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3be2027b4fa55b3f314dd34dde5a3534fe7c309c8bb8daba31b886674e6e9b1c' 
  AND token = 'w+vULvUZdC8eA7WLOtXPhcFA5EWLXnRgKLBW1mWc5DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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