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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37c8ffabdca657930adc887b1967a14493303e8195bfa450c8ea0c0ffd5ed377' 
  AND token = 'wq9AxpmFreypuB/u1PNT7j/rYlcYUMwAjcwr6w8hvXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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