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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01dfe3207af6f8bee8f2ea1cd803d9a590c419d1515ce0bbbc11f57633baa61d' 
  AND token = 'puWupGp4eSoJixi1hDgF6YsiQuQ4zSwO4Gv0DI2Qct0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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