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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ede4cbbfab143294d1218057b0c876e4ef6d9d5796d1146501b9ec53d981527a' 
  AND token = 'zHOtKRkk7Y6SQA1UG8IqFYMkNHYfI8/UazksOqyN4/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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