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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd99412b076d6390b498f3cd8c1debeeb605969cd2668e77a80f6beb333697ab' 
  AND token = '04WKNpjliUCfcoGYCcHpAR1mIs59kvvajYF7myl3Q1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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