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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '77f143e125220826001257a6697a5fe429b4dbee67e0f2d31c996fc1bc1b9858' 
  AND token = '0abM3A47Z708v8TkbXDSqe0PiZu7D6lOl2xGm3e+oyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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