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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1f66708db0686ff1259f79fe4ed3ab34a89b1dd27d53392a6b01f69b17b5ae3' 
  AND token = 'ikAaqYmQP1emyiwbWEdcNDK6jhQQRovbvxxpaupZgIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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