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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '715ddc94a735c515a511d7c023dfb4061626f47b8d51a3688bc2bb960c73ec88' 
  AND token = 'QYPta7Vpidgd1MpjZYofL2iB6nrabX/5zTG6ouy32eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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