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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cbe5e0e91813f75a719ee05e2ebbff940d2c4e344c89caec07c1d526ea1048d2' 
  AND token = '9NYp6zuvYE3HcDxRq0h29Kq76Bfz893sPgDc8LA7RVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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