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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '04e6330796e01d6ea19fca7054d597ffd7b056410922d7b91e0cb461acc569e5' 
  AND token = 'ifD471mb+clXW/Ny7N0SS3yvnuVAVEx99zpWx+XZplw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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