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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2335314b773149f47e810148dbba6cca39ff94e9bbb0cc71677d7fc8ea135bde' 
  AND token = 'DS0HF0UsOL1ntuYufkwPbkp2ntZHT+jB68/sRbFejjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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