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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8fae02410456c433efa70489dcde41ad390b84ce79b3b4484ed8e6e8f0c1c590' 
  AND token = '9m0+8Lz0bzcazKk1BqkMY7cJcRyK6DhY94RxB0c/FFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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