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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aadaf68071cd2977b71d9ebae2eb29936c16e97d5d30822e01f7ff2b19ebd225' 
  AND token = 'T00zAuFWwaWJ466jtm+63fzG3QPkqIFBa9l67dtdQ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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