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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47dc43718cac1c54860b512b5cb6dd1080f7d95f1b050925b5501bf70fce8649' 
  AND token = 'fyAU1pxaMmvCD/sp8EArsCBV9/QqY+5PLSNZClEZcYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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