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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98b19dc67e20bc87f89576587ea0864e586dac5fa28f7c62dc111fa7348be49e' 
  AND token = 'llHWLgOn8i6HI+QR0buTfyuJpmcnuTktq9wqlTGfHog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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