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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9a4b53107f4ab446f6fc27f41840ac46891994d8364652bd7eac39c01847d80' 
  AND token = 'zCduaYG9ubS0BAekSlWBhjYtE01xCV0MLxMmBfBUGgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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