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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8027fc64649f1d7f65fc553139815e1a8b12e593e26fb25999be72174b16652' 
  AND token = '5khUMnbKftCJxH/ssnHjSfZTTepJiC77YBf9hkwIsD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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