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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31dff626fc1f4b1d658dcdd9f9796ada56fede8942c4f1b4829d6fc61a92071e' 
  AND token = '/HTDh1HZM0Wwi4rYtQtIXoQ1DDXcGPFzr83v9lQlWHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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