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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b70b3265a237a03553d8f33fffa9c193b94a3a06e715886f731f672eaaf5243e' 
  AND token = 'YhNetRAc6CBOQbOGuBJmclTbjAAE9a6ijKQKpVM8d0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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