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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c3e0093ffcd3c5e1ac86fe79400bd2c897877062057682e4ca0db8db5ca2c5c' 
  AND token = 'bYi0rgP3eOd8xIfqi1E5NWEDOLZMLbAtui9D8BO4KTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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