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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a48ed6ef518fde169ecacded7c185d253457e4b784bc75e21d30f20cf9cc98b1' 
  AND token = 'sh043Bm41H3ZKx3YXGLTrrgwnnUyPW9rxp8JfuimCuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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