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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '62fb0210ca0ddafc5305e6e063f6e79fa3cb3f74a058002da2d4faeea0a301a7' 
  AND token = 'GyI56zf0lD70om3P0nE2RHRFj5dtxWjrVb+rHG2bAo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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