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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ec4e10baa24df9f473dbd76a6abeedf24bb8a871d845e49f6de354dc17639e1a' 
  AND token = 'Q4U+BIMF+NnPrkq+sEuoN2EUuu4pl4DX+k1+Hv8mx74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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