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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'df62201f17482b618c7679ee7fcd1383b277beeedf859be8b7676b3bc0f33fd8' 
  AND token = '74d1E4d1OdSJ/3W6os9YiEjv500JV6sNA1b2791C0GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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