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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e0ddad89501f3bc4bfb440f9f11c1a3ed99fdbdccdd3b401580c14fdf8685db' 
  AND token = 'g46CsF2qcUywbw7VcQ4baDwYfZDEGSdUpXkwZ2AIM2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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