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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2e97380c3954dbf0d538cf9e0142fd4def5b2673ec115e52ad5340c554d89a4' 
  AND token = 'E3quxndU7HjiMyBn+Q8SgwQT+94xJdiXcxuiGqd0iCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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