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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34a80374108827ebba063c5d6668486a7b27b2f5a2064d3d14323f314eb911df' 
  AND token = 'CyYswygo9RB48tUvWKf2p4c3+7+59u9QyIN8Qp+eNQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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