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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b1e04d53f2f93220bef1799c1dafebb1006e4911d0595c7c30b9989eb8dc8f9' 
  AND token = 'lT/xi7vSkXcnf68mrwR672+nfUYsfi3IQ1ufJguiK5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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