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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e04fcc330ae29c276a4677ee87ea110d102433ecc44bedd593474a8cc858db1' 
  AND token = 'EJma4oeBKqHcliLAZqBMd3vCdSluNDBURPmzHUleoFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00181

JSON explain

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