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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '873c84df46582c66b467bf5734c5038669fb7d63868719d3d0dd59d8dde3f0a4' 
  AND token = 'Aktiy5tyJnCdLMW+f7/yG51BJbfDYHFjG4e+zUqOk54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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