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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '35be00909781a4f9ef0df783ae895d9978ed2b3e60cfddb9ed938f9c46a4231b' 
  AND token = 'uzra5jgaS/L+hHdZTjjilDtL3+uFr6M+dlggZY2Rswg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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