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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6125bb259eca9214804302585800f84ea7a7eb9fad5fef5bfd6ef5a65305c9e2' 
  AND token = 'tdUHsZd4CS+2MlhdelO3Sl/qV0TImcxzLkHUPJsgLHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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