SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26734cb89a0d8765d7ea55536998b0b1492147c2f715d1fbdd3a71ea7eb576b8' 
  AND token = 'l24nX2KHpMwH6PZvUtzLTX8wBASvBR5b2bbPHf91Rcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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