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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a8c451ac282840755da58b2c7612ff8fde35fcc9b0f5464268c152dcf9ba9976' 
  AND token = '3BxkFleS3tTvg0mjqr7p5SOUlm31ZmcguEO23OfFVmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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