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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4e72bd41fbda204db43c72e44c6ae706be8aa6ea47f52e8ea2ffea2871bc9c43' 
  AND token = '/4zshXWI+j+3OBd52QsN0Xt2cSvmSEe72fPdaJe+H/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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