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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f215ce1d5f41c672e374fc158a70214961e60864df81c95397bd275b8d8b6d8b' 
  AND token = '396k8nuw6LM14asiSx5BUKmDMnyTUNABq5pnE+62/Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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