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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53a6c438bff64e62e6fee7384704b52a8575d809f20d6a5d0f5098f3e626988a' 
  AND token = 'dy8YETjLw6p7tUqkpvLd6OSWyF6suDm7eUsYvvPUs40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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