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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2f42738f93132a2b3eeb38dd58413f6d1f287c5e8b729f881ca1e599ba8f1cf' 
  AND token = '4CBoD7Rf5wKotNB+tWA6oj6RRQrU8FmmRagGKITHMzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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