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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b84454fe57b46512c3d2efac382fb92bca57d58947b87505edffe5daa73893f8' 
  AND token = 'hOViK2OEtE02g4a2ts51pWgPJoGMX/VslRMjAPSBUa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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