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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '53e5d724d0493571a1287d4c08ead3b8c8ed2cfc44ea495afa95e8e5cafad0af' 
  AND token = '7AQniOKr4Qrlbproi2kvSsjKRVHliNX28cpx2xfH5lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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