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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c0d02a39d5f7d4522356954ad4796db29412ebeec705b4c3ce69a7aec4c9a7a9' 
  AND token = '7fDm3t/AIZ7td6dVJFym6kREYNiu18Rt93P4et4WW1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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