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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7bd86060d9c54d3a1d7b4cef15ff1410277450aa564e82ecaae02742353c1ddc' 
  AND token = 's0fRU/uW5VnTt8dLav7e0DlLDfBNMwakhtVY/tkL/fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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