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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '68b77f7c551741c35ce8a15a5a5d21e02bfce15ec96050664ffb4d58446333d8' 
  AND token = 'ogaxvNRLBHNsENdoexBt+twP5BNHGFo9WO9z2EO5Wqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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