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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f66452426ca495defbcc870f3c94c8a1df4c7dad5e646244c42d60f1e7317ea' 
  AND token = 'q6fiq8Zl7oIqsTmjYIP1gn+/bTAPn6yFVGIWIyWzJNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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