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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2aa080950e59a27fe4731ed6c9949073e86c0f9512aad9fc95f452588db925dc' 
  AND token = '19IM6sEHYudl0gDD2mNcWj63IV7mr/2kDFcPuqteXQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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