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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '183dffc3d00f9e12e170e6e97f4fb4bafa6970bafd90975d1d082912fc705a7f' 
  AND token = 'loj1YTzr0PYpdiJIhtD/ruwFvrVuANrXA1aVk8NyvFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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