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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe2f05ba0dde532087b42bf35d25eaf1d93d2c71134b53ed91a10ef254a9fcaa' 
  AND token = '9euTp74plH3s7MCzNXQyueAlI1U4aw6Ul4UnJbpCkR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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