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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4cc33efca53e5f3098f9615a028d50fa9328dd53746d4038a7393c0d0b3140e0' 
  AND token = '5/9OnWwDDo6m4FHfsgUTz/O3e2DpqcsI/Szwd7T06io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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