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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02228e61f786f7a53405c0100e794a1acaac89bc1b72f6d7d918aa18aa86601f' 
  AND token = 'R06uPNlSXl9iOuPD1KP2BeYhgxvJGLVGbnuPUGbYZfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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