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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '550014a523c98832c1f4ff9e370ac2bafcfb273e3bfc8a80d8951a6f9511c29e' 
  AND token = 'w09aRBGXy6Bos6xpEfzRpbHXlQYZw1Whn6e5jJT98T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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